@Override
public Comment addCommentAsync(String commentText, String postId) {
startCheckingIfPostExists(postId);
Firebase newCommentRef = commentsFirebaseRef.push();
if (!finishCheckingIfPostExists()) {
newCommentRef.removeValue();
throw new IllegalArgumentException("Post being commented on does " + "not exist.");
}
String newCommentId = newCommentRef.getKey();
long timestamp = new Date().getTime();
int zeroDownvotes = 0;
Comment newComment =
new Comment(
newCommentId, postId, getLoggedInUserId(), commentText, timestamp, zeroDownvotes);
newCommentRef.setValue(newComment);
return newComment;
}
// Elimina de la base de datos los alumnos seleccionados, actualiza el
// adaptador y cierra el modo de acción conextual.
public void eliminarAlumnosSeleccionados() {
// Se obtiene el array con las posiciones seleccionadas.
ArrayList<Integer> seleccionados = mAdaptador.getSelectedItemsPositions();
// Por cada selección.
for (int i = 0; i < seleccionados.size(); i++) {
// Se obtiene la referencia al alumno.
Firebase refAlumno = mAdaptador.getRef(seleccionados.get(i));
// Se elimina el alumo de la bd.
refAlumno.removeValue();
}
lblNuevoAlumno.setVisibility(mAdaptador.isEmpty() ? View.VISIBLE : View.INVISIBLE);
// Se finaliza el modo contextual.
mActionMode.finish();
}
private void eliminarAlumno(int position) {
// Se obtiene la referencia al alumno.
Firebase refAlumno = mAdaptador.getRef(position);
final String key = refAlumno.getKey();
final Alumno alumno = mAdaptador.getItem(position);
// Se borra de la base de datos.
refAlumno.removeValue();
lblNuevoAlumno.setVisibility(mAdaptador.isEmpty() ? View.VISIBLE : View.INVISIBLE);
Snackbar snackbar =
Snackbar.make(lblNuevoAlumno, R.string.alumno_eliminado, Snackbar.LENGTH_LONG);
snackbar.setAction(
R.string.deshacer,
new View.OnClickListener() {
@Override
public void onClick(View v) {
agregarAlumno(key, alumno);
}
});
snackbar.show();
}
@Override
public Comment addCommentSync(String commentText, String postId) {
startCheckingIfPostExists(postId);
Firebase newCommentRef = commentsFirebaseRef.push();
if (!finishCheckingIfPostExists()) {
newCommentRef.removeValue();
throw new IllegalArgumentException("Post being commented on does " + "not exist.");
}
String newCommentId = newCommentRef.getKey();
long timestamp = new Date().getTime();
int zeroDownvotes = 0;
Comment newComment =
new Comment(
newCommentId, postId, getLoggedInUserId(), commentText, timestamp, zeroDownvotes);
final CountDownLatch latch = new CountDownLatch(1);
newCommentRef.setValue(
newComment,
new Firebase.CompletionListener() {
@Override
public void onComplete(FirebaseError firebaseError, Firebase firebase) {
latch.countDown();
}
});
try {
latch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
return newComment;
}
@Override
public Comment deleteComment(String commentId) {
Firebase firebaseCommentRef = newFirebaseRefForComment(commentId);
FirebaseSyncRequester<Comment> commentRequester =
new FirebaseSyncRequester<>(firebaseCommentRef, Comment.class);
Comment commentToReturn = null;
if (commentRequester.exists()) {
final CountDownLatch latch = new CountDownLatch(1);
firebaseCommentRef.removeValue(
new Firebase.CompletionListener() {
@Override
public void onComplete(FirebaseError firebaseError, Firebase firebase) {
if (firebaseError != null) {
throw firebaseError.toException();
}
latch.countDown();
}
});
try {
latch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
commentToReturn = commentRequester.get();
} else {
throw new IllegalArgumentException("Comment with id " + commentId + " does not exist.");
}
return commentToReturn;
}
@Override
public void remove(String id) {
Firebase childRef = ref.child(id);
childRef.removeValue();
}
